WO1988007842A1 - Magnetically suspended rotor axial flow blood pump - Google Patents
Magnetically suspended rotor axial flow blood pump Download PDFInfo
- Publication number
- WO1988007842A1 WO1988007842A1 PCT/US1988/001253 US8801253W WO8807842A1 WO 1988007842 A1 WO1988007842 A1 WO 1988007842A1 US 8801253 W US8801253 W US 8801253W WO 8807842 A1 WO8807842 A1 WO 8807842A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- pump
- blood
- blood conduit
- conduit
- Prior art date
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/048—Bearings magnetic; electromagnetic
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
- A61M60/237—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/419—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/50—Details relating to control
- A61M60/508—Electronic control means, e.g. for feedback regulation
- A61M60/538—Regulation using real-time blood pump operational parameter data, e.g. motor current
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D3/00—Axial-flow pumps
- F04D3/005—Axial-flow pumps with a conventional single stage rotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/047—Details of housings; Mounting of active magnetic bearings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2316/00—Apparatus in health or amusement
- F16C2316/10—Apparatus in health or amusement in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
- F16C2316/18—Pumps for pumping blood
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/44—Centrifugal pumps
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S415/00—Rotary kinetic fluid motors or pumps
- Y10S415/90—Rotary blood pump
Definitions
- This invention relates to magnetically suspended rotor axial flow blood pumps, and more particularly to an implantable pump for chronic heart assist.
- U.S. Patent No. 4,625,712 discloses a miniature high-speed axial flow intravascular blood pump percutaneously inserted and powered through a drive cable from outside the patient's body for emergency or other temporary heart assist.
- the pump of the present invention solves the above-stated problems by providing an axial flow pump with a magnetically suspended rotor in which both alignment and torque are provided by a pair of axially spaced sets of stator armatures and corresponding permanent magnets in the rotor.
- the position and inclination of the rotor axis are sensed in the pump of the invention by sensors imbedded in the stator blades of the pump.
- the use of rare earth magnetic materials in the rotor makes it possible to maintain a substantial gap between the poles of the stator armature and the rotor so as to provide a substantial blood flow path area, yet the location of the rotor position sensors in the pump stator blades makes it possible to sense extremely small position changes of the rotor axis very rapidly.
- Fig. 1 is an axial section, partially in schematic form, of an axial flow blood pump constructed in accordance with this invention
- Fig. 2 is a schematic section along line 2-2 of Fig. 1;
- Fig. 3 is a fragmentary section along line 3-3 of Fig. 1;
- Fig. 4 is a schematic view illustrating the functioning of the position sensing and axial centering features of the device of Fig. 1.
- Fig. 1 shows, in somewhat schematic form, a blood pump 10 constructed in accordance with this invention.
- the pump components external to the blood flow path 12 are mounted on a cylindrical blood conduit 14.
- Motor armatures 18 are positioned at each end of pump 10.
- Appropriate electronic and microprocessor circuitry 20 may be positioned at any convenient location on the pump 10 or elsewhere, and is shown in Fig. 1 as connected to the pump 10 by inputs 21 and outputs 23.
- Axially spaced flux sensors 22 are positioned between the armatures 18 on the outside of the blood conduit 14.
- Electric power is supplied to the pump 10 by conventional means such as wiring 24 leading to an appropriate percutaneous power supply or a transcutaneous transformer and rectifier (not shown) .
- the electronic and microprocessor circuits 20 control the currents in the various windings 25 of the armatures 18 in a manner described below.
- Three or more pump stator blades 15 are suspended from the inner surface 2 ⁇ of the blood conduit 14.
- the rotor 16 preferably carries a corresponding number of pump rotor blades 28.
- the pump stator blades • 15 and the pump rotor blades 28 cooperate to form a pumping stage in accordance with well-known principles of axial flow pump design.
- the rotor 16 of this invention is magnetically suspended in the blood stream and makes no physical contact with the blood conduit 14.
- an annular portion 30 of the blood flow path 12 having a substantial cross-sectional area exists betwen the hub 32 of rotor 16 and the inner wall 26 of blood conduit 14.
- the invention provides thin sensor strips 36 of highly permeable magnetic material such as soft iron embedded in each of the three (Fig. 3) or more pump stator blades 15 whose inner ends 38 are closely adjacent to the rotor 16, and whose outer ends 39 are connected to appropriate conventional flux sensors 22, 23 such as Hall sensors.
- the suspended rotor 16 carries a pair of spaced sensor magnets 40 whose disk-shaped pole pieces 44, 46 are disposed transversely to the rotor axis 34. If, for example, pole piece 44 is a north pole and pole piece 46 is a south pole, a flux field 42 will exist between the pole pieces 44, 46 radially outwardly along the periphery of the rotor 16 (Fig. 4) .
- the field 42 rapidly weakens in a radially outward direction. Consequently, the inner ends 38 of the sensor strips 36 are immersed in a field whose strength is a function of the gap between the pump stator blade 15 and the rotor 16 at the location of end 38.
- the sensor strips 36 transmit these field strength indications to their respective flux sensors 22.
- each of the stator armatures 18 may have twelve poles P ⁇ through
- the rotor 16 contains a rotor magnet 50, preferably of a rare earth material such as a neodymium-boron-iron alloy which is orthogonally polarized as shown in Fig. 2.
- a rare earth magnetic material in the rotor magnet 50 allows a substantial gap 51 (Fig. 1) to exist between the poles P of armatures 18 and the hub 32 of rotor 16 without substantial loss of motive power.
- the control circuitry 20 controls the speed of the rotor 16 by controlling the commutation sequence, and it controls the centering and alignment of the rotor axis 34 by selectively varying the current in the appropriate windings 25 of armatures 18.
- stator blades 15 are relatively long not only in 'order to space the sensor strips 36 as far apart as possible for improved tilt control, but also because long stator blades are physiologically advantageous in reducing turbulence in the blood flow.
- the resulting shortness of the pump 10 is a distinct advantage with respect to anatomic compatibility. Magnetic interference between the rotor magnets 50 and the sensor magnets 40 is prevented by the use of magnetic shields 54.
- the self-centering action of the rotor magnets 50 maintains the proper position of rotor 16 in the axial direction. This is true even when the pump 10 is not energized because the rotor magnets 50 tend to move toward the iron of the armatures 18.
- the spring rate associated with the axial stability of the interaction between the rotor magnets 50 and the armature 18 may be low enough in certain practical applications of the invention to allow greater than desirable axial motion of the suspended rotor 16 when its pressure differential changes as the heart alternates between systole and diastole.
- a higher axial spring rate can be built into the configuration of Fig. 1 by utilizing one or more centering magnet sets 56 located midway between the armatures 18 (or, for a plurality of sets 56, equidistantly from that midpoint) to avoid the imposition of any tilting forces on the axis 34.
- Fig. 4 illustrates the magnetic fields involved in the operation of the sensor strips 36 and the centering magnet set 56.
- the ends 38 of the sensor strips 36 are immersed in a generally axially directed field 42 extending between the pole pieces 44, 46 of sensor magnets 40.
- the pole pieces 58, 60 of annular magnets 62 on the blood conduit 14 cooperate with the pole pieces 64, 66 of disk magnets 68 to create radially directed fields 70 which strongly resist any axial movement of rotor 16 without substantially impeding the radial or rotational movement imparted to rotor 16 by the interaction of armatures 18 and rotor magnets 50.
- the present invention provides an extremely compact implantable blood pump of simple and rugged construction which produces a large blood flow with a pump of highly anatomically compatible dimensions.
- the pump 10 inherently has .'high reliability and long life due to the absence of any contact between mutually movable mechanical elements during operation
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heart & Thoracic Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Veterinary Medicine (AREA)
- Hematology (AREA)
- Anesthesiology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Biomedical Technology (AREA)
- Cardiology (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Physics & Mathematics (AREA)
- External Artificial Organs (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A fully implantable axial flow blood pump (10) having a magnetically suspended rotor (16) in which both alignment and torque are provided by a pair of axially spaced sets of stator armatures (18) and corresponding permanent magnets (50) in the rotor (16). The position and inclination of the rotor axis (34) are sensed in the pump (10) by sensors (36) imbedded in the stator blades (15). The use of rare earth magnetic materials in the rotor (16) makes it possible to maintain a substantial blood flow path area (30) between the poles (44, 46) of the stator armature (18) and the rotor (16) so as to allow a substantial blood flow from blood flow path (12), yet the location of the rotor position sensors (36) in the pump stator blades (15) makes it possible to sense extremely small position changes of the rotor axis (34) very rapidly.
Description
MAGNETICALLY SUSPENDED ROTOR AXIAL FLOW BLOOD PUMP
Field of the Invention
This invention relates to magnetically suspended rotor axial flow blood pumps, and more particularly to an implantable pump for chronic heart assist.
Background of the Invention
U.S. Patent No. 4,625,712 discloses a miniature high-speed axial flow intravascular blood pump percutaneously inserted and powered through a drive cable from outside the patient's body for emergency or other temporary heart assist.
It would be highly desirable to provide compact pumps of this type for patients needing long-term (chronic) heart assist. Such pumps are much more anatomically compatible than the large implantable heart assist pumps currently being developed. They also have the potential for much lower manufacturing costs .
Unfortunately, the design of fully implantable axial flow blood pumps with a self-contained motor presents major problems. The approach discussed in U.S. Patent No. 4,625,712 utilizes the fluid flow of a purged fluid seal to prevent entry of blood elements into the pump. Supplying such a purge fluid from within the body presents major technical challenges. Percutaneous supply of the purge fluid degrades the patient's quality of life and provides a potential infection entry site.
Summary of the Invention
The pump of the present invention solves the above-stated problems by providing an axial flow pump with a magnetically suspended rotor in which both alignment and torque are provided by a pair of axially spaced sets of stator armatures and corresponding permanent magnets in the rotor. The position and inclination of the rotor axis are sensed in the pump of the invention by sensors imbedded in the stator blades of the pump.
The use of rare earth magnetic materials in the
rotor makes it possible to maintain a substantial gap between the poles of the stator armature and the rotor so as to provide a substantial blood flow path area, yet the location of the rotor position sensors in the pump stator blades makes it possible to sense extremely small position changes of the rotor axis very rapidly.
It is therefore the object of this invention to provide a miniature self-contained electric axial flow blood pump.
It is another object of the invention to accomplish this result by using a magnetically suspended rotor with a substantial gap between the rotor and the stator poles, and by placing the sensing elements of the axis position sensors inside the pump stator blades .
Brief description of the drawings
Fig. 1 is an axial section, partially in schematic form, of an axial flow blood pump constructed in accordance with this invention;
Fig. 2 is a schematic section along line 2-2 of Fig. 1;
Fig. 3 is a fragmentary section along line 3-3 of Fig. 1; and
Fig. 4 is a schematic view illustrating the functioning of the position sensing and axial centering features of the device of Fig. 1.
Description of the preferred embodiment
Fig. 1 shows, in somewhat schematic form, a blood pump 10 constructed in accordance with this invention. The pump components external to the blood flow path 12 are mounted on a cylindrical blood conduit 14. The internal components of the pump 10, which are immersed in the blood flow in path 12, consist of pump stator blades 15 and a magnetically suspended rotor 16. Motor armatures 18 are positioned at each end of pump 10. Appropriate electronic and microprocessor circuitry 20 may be positioned at any convenient location on the pump 10 or elsewhere, and is shown in Fig. 1 as connected to the pump 10 by inputs 21 and outputs 23.
Axially spaced flux sensors 22 are positioned between the armatures 18 on the outside of the blood conduit 14. Electric power is supplied to the pump 10 by conventional means such as wiring 24 leading to an appropriate percutaneous power supply or a transcutaneous transformer and rectifier (not shown) . The electronic and microprocessor circuits 20 control the currents in the various windings 25 of the armatures 18 in a manner described below.
Three or more pump stator blades 15 are suspended from the inner surface 2β of the blood conduit 14. The rotor 16 preferably carries a corresponding number of pump rotor blades 28. The pump stator blades • 15 and the pump rotor blades 28 cooperate to form a pumping stage in accordance with well-known principles of axial flow pump design.
In order to avoid the need for close-tolerance bearings and for a seal which would require a supply of fluid other than blood, the rotor 16 of this invention is magnetically suspended in the blood stream and makes no physical contact with the blood conduit 14. In fact, as will be seen in Fig. 1, an annular portion 30 of the blood flow path 12 having a substantial
cross-sectional area exists betwen the hub 32 of rotor 16 and the inner wall 26 of blood conduit 14.
Because of the close clearance between the rotor 16 and the pump stator blades 15, and also because of the strong dynamic forces operating on the rotor 16 at high rotary speeds, it is essential that the axis 34 of rotor 16 be maintained in a precisely aligned and centered position at all times. The alignment and "centering of the rotor is accomplished by the armatures 18 in a manner hereafter described.
Positional information regarding the centering and inclination or alignment of the rotor axis could theoretically be gleaned from measurements taken outside the blood conduit 14, but due to the substantial gap between the inner surface 26 of blood conduit 14 and the rotor 16, that measurement is not sufficiently precise. For this reason, the invention provides thin sensor strips 36 of highly permeable magnetic material such as soft iron embedded in each of the three (Fig. 3) or more pump stator blades 15 whose inner ends 38 are closely adjacent to the rotor 16, and whose outer ends 39 are connected to appropriate
conventional flux sensors 22, 23 such as Hall sensors.
The suspended rotor 16 carries a pair of spaced sensor magnets 40 whose disk-shaped pole pieces 44, 46 are disposed transversely to the rotor axis 34. If, for example, pole piece 44 is a north pole and pole piece 46 is a south pole, a flux field 42 will exist between the pole pieces 44, 46 radially outwardly along the periphery of the rotor 16 (Fig. 4) . The field 42 rapidly weakens in a radially outward direction. Consequently, the inner ends 38 of the sensor strips 36 are immersed in a field whose strength is a function of the gap between the pump stator blade 15 and the rotor 16 at the location of end 38. The sensor strips 36 transmit these field strength indications to their respective flux sensors 22. Because of the proximity of ends 38 to the periphery of rotor 16, a small change in the position of rotor axis 34 causes a relatively large change in the flux sensed by sensor strips 36 and therefore by the flux sensors 22. The flux sensors 22 in turn provide signals to the circuitry 20 which translates them by conventional triangulation programming (cf. Fig. 2) into centering and alignment data for controlling the currents in the individual
windings of armatures 18.
As schematically shown in Fig. 2, each of the stator armatures 18 may have twelve poles Pχ through
P12 disposed equidistantly about rotor 16. In the areas of the armatures 18, the rotor 16 contains a rotor magnet 50, preferably of a rare earth material such as a neodymium-boron-iron alloy which is orthogonally polarized as shown in Fig. 2. The use of a rare earth magnetic material in the rotor magnet 50 allows a substantial gap 51 (Fig. 1) to exist between the poles P of armatures 18 and the hub 32 of rotor 16 without substantial loss of motive power.
In the rotor position of Fig. 2, reducing the current in the winding of pole P12 and/or increasing it in the winding of pole Pe will move the rotor downward, while reducing the current at P3 and/or increasing it at Pg will move it to the lef . Opposite actions will have the opposite effect. At the same time,- the indicated polarities of poles ?-,_, P2, P4, P5, P7, P8, P10 and P11 cause the rotor 16 to rotate in a clockwise
direction .
When point 52 on the rotor has moved to a position half way between poles P12 and ^± r the polarity of the currents in the windings 25 of the armatures 18 is commutated clockwise by thirty degrees so that Px, P4, P7 and P10 become the positioning poles while the remaining poles become the torquing poles.
The control circuitry 20 controls the speed of the rotor 16 by controlling the commutation sequence, and it controls the centering and alignment of the rotor axis 34 by selectively varying the current in the appropriate windings 25 of armatures 18.
It will be noted that the construction described herein, because it does .not require any separate alignment coils, nor any position sensors outside the existing pump stator blades, allows the pump 10 to be made quite short . The stator blades 15 are relatively long not only in 'order to space the sensor strips 36 as far apart as possible for improved tilt control, but also because long stator blades are physiologically advantageous in reducing turbulence in
the blood flow. The resulting shortness of the pump 10 is a distinct advantage with respect to anatomic compatibility. Magnetic interference between the rotor magnets 50 and the sensor magnets 40 is prevented by the use of magnetic shields 54.
Basically, the self-centering action of the rotor magnets 50 maintains the proper position of rotor 16 in the axial direction. This is true even when the pump 10 is not energized because the rotor magnets 50 tend to move toward the iron of the armatures 18. However, due to the relatively large gaps 51 required to accommodate the blood flow annulus 30, the spring rate associated with the axial stability of the interaction between the rotor magnets 50 and the armature 18 may be low enough in certain practical applications of the invention to allow greater than desirable axial motion of the suspended rotor 16 when its pressure differential changes as the heart alternates between systole and diastole. A higher axial spring rate can be built into the configuration of Fig. 1 by utilizing one or more centering magnet sets 56 located midway between the armatures 18 (or, for a plurality of sets 56, equidistantly from that midpoint)
to avoid the imposition of any tilting forces on the axis 34.
Fig. 4 illustrates the magnetic fields involved in the operation of the sensor strips 36 and the centering magnet set 56. The ends 38 of the sensor strips 36 are immersed in a generally axially directed field 42 extending between the pole pieces 44, 46 of sensor magnets 40. By contrast, in the centering magnet set 56, the pole pieces 58, 60 of annular magnets 62 on the blood conduit 14 cooperate with the pole pieces 64, 66 of disk magnets 68 to create radially directed fields 70 which strongly resist any axial movement of rotor 16 without substantially impeding the radial or rotational movement imparted to rotor 16 by the interaction of armatures 18 and rotor magnets 50.
It will be seen that the present invention provides an extremely compact implantable blood pump of simple and rugged construction which produces a large blood flow with a pump of highly anatomically compatible dimensions. The pump 10 inherently has .'high reliability and long life due to the absence of any contact between mutually movable mechanical elements
during operation
Claims
1. An implantable axial flow blood pump, comprising: a) a substantially cylindrical blood conduit; b) at least three pump stator blades extending inwardly from the inner surface of said blood conduit; c) a substantially cylindrical rotor rotatable within said blood conduit and having a plurality of rotor blades; d) the hub of said rotor being spaced from the inner surface of said blood conduit a sufficient distance to define between said inner blood conduit surface and said hub an annular space sufficient to accommodate the blood flow through said pump; e) said rotor being magnetically suspended coaxially with said stator, but out of physical contact therewith, during the operation of said pump; f) sensing means associated with said blood conduit for sensing the position of the axis of said rotor with respect to the axis of said blood conduit; g) positioning means on said blood conduit responsive to said sensing means for maintaining said
rotor in a position coaxial with said blood conduit; and h) torquing means on said blood conduit for imparting a rotary torque to said rotor.
2. The blood pump of claim 1, in which said positioning and torquing means are jointly embodied by providing in said rotor a permanent magnet, and disposing outwardly of said blood conduit an armature having a plurality of poles surrounding said rotor magnet, each of said poles being energized by a winding individually controllable with respect to current and polarity.
3. The blood pump of Claim 2, in wich said positioning and -torquing means consist of a pair of axially spaced armatures and a pair . of rotor magnets axially aligned therewith.
4. The blood pump of Claim 2, further comprising circuit means responsive to said sensing
means for controlling said current and simultaneously commutating said windings.
5. The blood pump of Claim 2, further comprising at least one centering magnet set on said blood conduit and in said rotor for urging said rotor into an axial position in which said rotor magnet is axially aligned with said armature.
6. The blood pump of Claim 5, in which there are two axially spaced armatures, and said centering magnet sets are disposed symmetrically with respect to the midpoint between said armatures .
7. The blood pump of Claim 1, in which said rotor includes axially spaced pole pieces of opposite polarity to produce annular magnetic fields around said rotor adjacent the ends of said pump stator blades, and said sensor means include flux sensors external of said blood conduit and highly permeable magnetic elements carried by said pump stator blades at each end thereof, said highly permeable magnetic elements extending between said magnetic fields and said flux sensors.
8. The blood pump of Claim 1, in which said rotor includes rotor magnets formed of a rare earth magnetic material.
9. The blood pump of Claim 8, in which said rare earth magnetic material is a neodymium-boron-iron alloy.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/036,304 US4779614A (en) | 1987-04-09 | 1987-04-09 | Magnetically suspended rotor axial flow blood pump |
US036,304 | 1987-04-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1988007842A1 true WO1988007842A1 (en) | 1988-10-20 |
Family
ID=21887845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1988/001253 WO1988007842A1 (en) | 1987-04-09 | 1988-04-08 | Magnetically suspended rotor axial flow blood pump |
Country Status (4)
Country | Link |
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US (1) | US4779614A (en) |
AU (1) | AU1701888A (en) |
CA (1) | CA1323467C (en) |
WO (1) | WO1988007842A1 (en) |
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- 1988-04-08 WO PCT/US1988/001253 patent/WO1988007842A1/en unknown
- 1988-04-08 AU AU17018/88A patent/AU1701888A/en not_active Abandoned
- 1988-04-11 CA CA000563754A patent/CA1323467C/en not_active Expired - Lifetime
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US4123666A (en) * | 1975-12-02 | 1978-10-31 | Escher Wyss Limited | Rim-type hydroelectric machine |
US4155022A (en) * | 1977-06-03 | 1979-05-15 | Otis Engineering Corporation | Line flow electric power generator |
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Cited By (26)
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EP0566806A1 (en) * | 1992-04-16 | 1993-10-27 | Shinko Electric Co. Ltd. | Magnetic bearing device |
US5237229A (en) * | 1992-04-16 | 1993-08-17 | Shinko Electric Co., Ltd. | Magnetic bearing device with a rotating magnetic field |
WO1996031934A1 (en) * | 1995-04-03 | 1996-10-10 | Sulzer Electronics Ag | Rotary machine with an electromagnetic rotary drive |
EP0903835A1 (en) * | 1995-04-03 | 1999-03-24 | Z&D Ltd. | Axial flow pump/marine propeller |
US6100618A (en) * | 1995-04-03 | 2000-08-08 | Sulzer Electronics Ag | Rotary machine with an electromagnetic rotary drive |
WO1996041082A1 (en) * | 1995-06-07 | 1996-12-19 | HER MAJESTY IN RIGHT OF CANADA represented by THE MINISTER OF NATURAL RESOURCES CANADA | Low flow-rate pump |
US5769069A (en) * | 1995-06-07 | 1998-06-23 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Natural Resources | Low flow-rate pump |
US5939813A (en) * | 1995-08-24 | 1999-08-17 | Sulzer Electronics Ag | Gap tube motor |
WO1997008808A1 (en) * | 1995-08-24 | 1997-03-06 | Sulzer Electronics Ag | Canned motor |
AU727084B2 (en) * | 1996-06-26 | 2000-11-30 | Government of the United States of America as represented by the Administrator of the National Aeronautics and Space Administration (NASA), The | Magnetically suspended miniature fluid pump and method of making the same |
WO1997049440A3 (en) * | 1996-06-26 | 1998-04-09 | Univ Pittsburgh | Magnetically suspended miniature fluid pump and method of making the same |
ES2153312A1 (en) * | 1996-06-26 | 2001-02-16 | Univ Pittsburgh | Magnetically suspended miniature fluid pump and method of making the same |
US7156802B2 (en) | 1997-09-05 | 2007-01-02 | Ventrassist Pty Ltd. And University Of Technology, Sydney | Rotary pump with hydrodynamically suspended impeller |
US6966748B2 (en) | 1997-09-05 | 2005-11-22 | Ventrassist PTY Ltd. and University of Technology at Sydney | Rotary pump with exclusively hydrodynamically suspended impeller |
US6250880B1 (en) | 1997-09-05 | 2001-06-26 | Ventrassist Pty. Ltd | Rotary pump with exclusively hydrodynamically suspended impeller |
US7476077B2 (en) | 1997-09-05 | 2009-01-13 | Ventrassist Pty Ltd. | Rotary pump with exclusively hydrodynamically suspended impeller |
US6638011B2 (en) | 1997-09-05 | 2003-10-28 | Ventrassist Pty Ltd | Rotary pump with exclusively hydrodynamically suspended impeller |
FR2771295A1 (en) * | 1997-11-26 | 1999-05-28 | Vascor Inc | BLOOD PUMP, APPARATUS AND METHOD FOR OPERATING IT AT CONTROLLED FLOW, HEART RATE AND ARRHYTHMIA TREATMENT SYSTEM AND APPARATUS FOR ARTIFICIAL HEART |
US6293901B1 (en) | 1997-11-26 | 2001-09-25 | Vascor, Inc. | Magnetically suspended fluid pump and control system |
US6375607B1 (en) | 1997-11-26 | 2002-04-23 | Vascor, Inc. | Magnetically suspended fluid pump and control system |
US6179773B1 (en) | 1997-11-26 | 2001-01-30 | Vascor, Inc. | Magnetically suspended fluid pump and control system |
AU765716B2 (en) * | 1998-12-03 | 2003-09-25 | Heartware, Inc. | Active magnetic bearing system for blood pump |
WO2000032257A1 (en) * | 1998-12-03 | 2000-06-08 | Kriton Medical, Inc. | Active magnetic bearing system for blood pump |
US6264635B1 (en) * | 1998-12-03 | 2001-07-24 | Kriton Medical, Inc. | Active magnetic bearing system for blood pump |
WO2014008078A1 (en) * | 2012-07-02 | 2014-01-09 | The Cleveland Clinic Foundation | Two-stage rotodynamic blood pump |
CN108025120A (en) * | 2015-09-11 | 2018-05-11 | 柏林心脏有限公司 | It is preferred for the blood pump of accessory heart |
Also Published As
Publication number | Publication date |
---|---|
CA1323467C (en) | 1993-10-26 |
AU1701888A (en) | 1988-11-04 |
US4779614A (en) | 1988-10-25 |
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